Nonreturn valve



G. C. DAVIS NONRETURN VALVE Filed July 10, 1926 Jr, i :L uw. HMH! llllllllllllll l I I I Il May 7, 1929.

Patented i May 7, A1929. l

UNITED *STATESA AvPMii-:nr oFFlfc-E.

GEORGE C. DAVIS, OF CIE-IICAGO,` ILLINOIS, ASSIGNOR TO G. 'M. DAVIS REGULATOR COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS. v i

NONRETURN VALVE.

Application ined July l1o,

My invention relates to Aimprovenfients in check or non-return valves particularly for gas or air lines and the like and has for one object to provide a new and improved type of the well-known non-return valve wherein the parts will be delicateiand sensitive,offer a minimum resistance to flow in one direction, make a positive lclosure inthe reverse direction land wherein the floatingy valve members may bevadjusted, replaced and manipulated with a minimunroif difficulty and complication.l Other objects will appear from time to time throughout the specificationand claims. 1 l l My vinvention is illustratedfmore or less diagrammatically in y the accompanying drawings, wherein-- y 1 .Figure lis a side elevation of the valve; Figure 2 is a section along theline 2 2 of Figure l. Y l f ,i

Figure 3 is a section along thelineB- of Figurel. l i. f l

. Like parts are indicated by like characters throughout the specification' and drawinvs. 1

tA is they valve casing;rA1 the intake and A2 the discharge pipe so that ygas or air Hows through the valve in the" direction shown by the arrow. The underside of the housing is bounded by a curved wall as at A3; the upper side which is open terminates in a flange A4 extending'clear across the area of the valve. A5 is an extension housing adapted to be bolted to the flange A4 and closedv by the cap A6.

The inside of the housing is flanged as at Q B.` Resting on this flange and held seatedr thereon by means of the set screws B1 B1LV are a plurality ofl grid members B2 BV2 eX- tending across the effective openingof the f valve.l Spaced beyond thevv down-streaml side of these grid members on the downstream side thereof is a bridge B3 held in place by the studs B4.

C are valve plates of such width as to bridge the gap between adjacent grid members. These plates are bolted at two points as at C1 C1 to the lug C2, ony the underside of thecap A6 andeXtend down through the housing A5 into the valve housing A and are adapted to lie along the grid members, the length of the plates C being such as to eX tend beyond the lower end of the grid members as indicated at C3 Ct. vThe bridge B3 limits thel forward movement of the ValveY 1926. Serial No. 121,665.

plates in the direction of ilow of the gas so as to maintain them in proper working re- -be easily removed for repair, renewal or eliange. The long housing through which the plates extend upwardlyvaway vfrom* the grid permits of these plates being longenough so that the fieXure or bending of the plates is on such a long arc'that crystallization land breakage is. reduced to aminimum. l

The two point attachment ofthese plates n'ialres 1t possible to anchor them rigidly at one .endl and withoutthe use of any ,ad-V

ditional guiding or positioning means other Vthan `the bridgewhich prevents theirbeingV driven. too tar andi permits their being held permanently in proper working position;

of spring steel plated with cadmium or othersuitable wear and corrosion resisting material. Since the plates are long and flex*- ible there isV not suiiicient bending of the plate to cause any appreciable distortion of,v

the plate orv of the protective coating. associated with it.

It willgbe evidentl thatwhile I have shown in my drawings an operative device, still many changes might be made in the size, shape, arrangement and disposition of parts without departing materially from the spirit i i The valve plates -or feathersare preferably of my invention and I wish, therefore, that l i my'showing be .taken as in a sense diagrammatic. f v

I claim: v y i l. Ina non-return valve, a housing open at one side in a direction at right angles to the line orP flow, a grid contained within the housing in the line of flow, a'closure for the open side of the housing, a flexible valve plate rigidly mounted on the closure land extending through the housing and overlying` the grid. l 'A Y 2. .A non-return valve comprising a housing, a removablegrid plate therein having a plurality of gridlbars extending across the line offlow, a seat for the plate, lmeans aecessible from the outside of wthe housing for locking the gridv plate on its seat, the housing being open along one side, an' extension housing in line with the opening, a closure therefor, a plurality olY i'iexible valve plates rigidly mounted on the closure extendingv through the extension housing, across the valve housing and adapted to lie alongside of and close the space between the grid bars, means on the down-stream side of the grid plate comprising a fixed bridgzjc for limiting the down-stream movement of the plates.

3. A non-return valve comprising` a housing, a grid plate therein, having a plurality of grid bars extending across the line of flow, the housing being open along one side, a closure for the open side., a plurality of flexible valve plates, .rigidly mounted on the closure extending across the valve housing and adapted to lie alongside of and close the space between the grid bars, means normally out of contact with the plates for limiting their down-stream movement, said means comprising. a bridge extending across the line of flow perpendicular to the grid bars on the down-stream side thereof.

' 4. A non-return valve comprising a'housing, a grid plate therein, having a plurality of grid barslextending across the line of flow, the housing being open along one side, a closure for the open side, aplurahty of flexible valve plates rigidly mounted onl the closure extending across the valve housing` and adapted to lie alongside of and close the space between the grid bars, the valve plates being substantially longer than the effective opening closed by them whereby their point of rigid attachmentvis far removed troin'the grid plates.

5. A non-return valve comprising'a housing, a grid therein, having a plurality of grid bars extending across the line of flow, a chamber extending laterally from one side oit the housing and open Jthereto, and located in the same general plane as the grid, a plu rality of flexible valveV plates anchored in the engage said bars andy close lthe spaces between them, elongated flexible valve supporting members carrying the shoes` and anchored at points removed iti'oin the valve seat, a housing extending laterally away from the vvalve seat and enclosing said ilexible members, anda cover for said housing Y 

